gnuplot-info — For questions and discussion about gnuplot

[Gnuplot-info] white labels in epslatex terminal

[Stepan R. <st...@ro...>]

Hello,
I have problem with plotting data using epslatex terminal. All text
is typeset in white color, which makes it unreadable on white backgroud.
This happens even with blacktext option for the terminal.

I use gnuplot 4.2 patchlevel 3 and 4. This problem never occured to me
before, just with this special combination of pm3d, map view, xrange etc...
My script with minimal failing example, input data and resulting
pdf generated by pdflatex is available at
http://www.roucka.eu/tmp/
The only solution that I found was to search and replace s/white/black/
in the traj2.tex file. Am I doing something wrong or is it a bug in gnuplot?

Thanks for any help
Stepan Roucka

Re: [Gnuplot-info] plot size vs. picture size

[Thomas S. <t.s...@fz...>]

everyting looks ok here:
dphi3d.eps and dphi3d_bb.eps show tics labels and axis labels, the bounding
box of dphi3d_bb.eps includes all labels (viewed with 'gv').

after running latex the labels are still there in both figures, see
http://www.nabble.com/file/p22947878/epstest.pdf epstest.pdf 
in which way does this file differ from yours?


atoms.h wrote:
> 
> Hi Thomas,
> 
> and thanks for your strong effort!
> 
> To your first question: The calculated bounding box did not include any
> labels whatsoever. The only thing visible was the plot itself and the
> colorbox.
> 
> As for the example: we did a short latex file containing the unprocessed
> eps image and a postprocessed image with eps2eps.
>  http://www.nabble.com/file/p22945452/epstest.tar.gz epstest.tar.gz 
> 
> For the plot itself we use:
> $ set terminal postscript eps enhanced color
> $ set view map
> $ ...
> $ splot "data.file" u 1:2:(0):3 w image
> 
> Thanks,
> Thomas
> 

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Re: [Gnuplot-info] plotting a line

[Hans-Bernhard B. <HBB...@t-...>]

markjoe wrote:
> ps 0.5 etc. Suppose I want to make a vertical line at today's date, exactly
> from top to bottom axis. 

See "help set arrow" and "help coordinates" to understand what this does:

   set arrow from '2009-04-07', graph 0 to '2009-04-07', graph 1 nohead

[Gnuplot-info] plotting a line

[markjoe <na...@ma...>]

Hi all,

Use gnuplot already ages, still I don't know all. E.g. I produce year plots
of something, very simple datafile, one column: plot 'data' using 0:1 pt 7
ps 0.5 etc. Suppose I want to make a vertical line at today's date, exactly
from top to bottom axis. I want to keep autoscale for y because that
produces nicer plots. How to draw that line? I don't know the exact maximum
gnuplot will choose for it's maximum. Any ideas?

Thanks, Mark
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Re: [Gnuplot-info] plot size vs. picture size

[Thomas S. <t.s...@fz...>]

gs -sDEVICE=bbox -dNOPAUSE -q -dBATCH your_file.eps
calculates the bounding box including everything which is not white,
that means the labels etc. should be inside the bounding box.

if you use 'ghostview', 'gv', 'display' or whatever to display your
eps file, are the labels shown after adjusting the bounding box?

how do you insert the eps file into your latex document?

maybe you could post a minimal example, i.e. a small plot script,
the resulting eps file, and some latex code that will show your
problem.


atoms.h wrote:
> 
> Well, 'postscript'...
> 
> 
> 
> Thomas Sefzick wrote:
>> 
>> which terminal are you using?
>> 'postscript' or 'pslatex'?
>> 
>> 
>> atoms.h wrote:
>>> 
>>> ...
>>> I tried that, but it doesn't seem to work since the min. bounding box
>>> measure doesn't include the labels, tic values and the title/file name
>>> etc. So it cuts right around the plot...
>>> ...
>>> 
>> 
>> 
> 
> 

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Re: [Gnuplot-info] plot size vs. picture size

[Thomas S. <t.s...@fz...>]

which terminal are you using?
'postscript' or 'pslatex'?


atoms.h wrote:
> 
> ...
> I tried that, but it doesn't seem to work since the min. bounding box
> measure doesn't include the labels, tic values and the title/file name
> etc. So it cuts right around the plot...
> ...
> 

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Re: [Gnuplot-info] plot size vs. picture size

[Thomas S. <t.s...@fz...>]

adjusting the bounding box seems to be the easiest solution for your problem.
first, you have to determine the minimum bounding box size:
gs -sDEVICE=bbox -dNOPAUSE -q -dBATCH your_file.eps
and then you edit the output of the above command into your
eps-file.


atoms.h wrote:
> 
> I searched for this some time but non of the usual stuff (e.g. margin,
> size etc.) seems to work.
> 
> The problem is for eps images that in some 3D projections (also in 2D
> plots), there appears to be a rather large 'frame' around the actual plot.
> Including such a plot in a latex document with looks rather nasty, since
> the latex title of the plot can be quite far from the labels.
> 
> So is there a way to either shrink down the picture size while maintaining
> the plot size or otherwise blowing up the plot size while maintaining the
> picture size.
> Either way I'm looking for a way to shrink the bounding box...
> 
> thanks,
> thomas
> 

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[Gnuplot-info] Title of each annotation not shown

[lehe <tim...@ya...>]

Hi,
I have 3 pieces of code. The first one can show the title "normal" and
"wrongness" of each annotation, while the second  and the third one cannot.
How to make the second and third code show the title of each annotation?
Thanks!

First code:
gnuplot <<EOF
set terminal postscript 'Helvetica' 18 enhanced eps color
set output "/tmp/stability.eps"
set xlabel "Log ratio of original sample before noise"
set ylabel "how many responses become greater after noise"
plot '${TMPDIR}/perturbations_a.dat' using 1:5 pt 7 ps 0.5 title "normal",\
      '${TMPDIR}/perturbations_b.dat' using 1:5 pt 7 ps 0.5 title
"wrongness"
EOF

Second code:
gnuplot <<EOF
set terminal postscript 'Helvetica' 18 enhanced eps color
set output "/tmp/perturbations1.eps"
set xlabel "Log ratio of original sample"
set ylabel "Perturbated predictor response"
plot [-60:-10][-10:10] '${TMPDIR}/perturbations_a.dat' with yerrorbars lw 1
pt 6 lt 1 lc 2 title "normal",\
                      '${TMPDIR}/perturbations_b.dat' with yerrorbars lw 1
pt 6 lt 1 lc 1 title "wrongness"
EOF

Third code:
gnuplot <<EOF
set terminal postscript 'Helvetica' 18 enhanced eps color
set output "/tmp/FP_stability.eps"
set xlabel "Log ratio of original sample before noise"
set ylabel "variance of '$1' response after noise"
plot [:][:] \
     '${TMPDIR}/pos_perturbations_a.dat' using 1:6 pt 6 lc 2 title
"normal",\
     '${TMPDIR}/pos_perturbations_b.dat' using 1:6 pt 6 lc 1 title
"wrongness"
EOF
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Re: [Gnuplot-info] Differences when using xrange compared to seperate values

[Hans-Bernhard B. <HBB...@t-...>]

Alexander Skwar wrote:

> What I don't get at all is, why the curves look so different.

Because you're using "smooth bezier".  The difference is caused by the 
smoothing process being applied on the whole dataset, not just those 
data inside the plot range.

[Gnuplot-info] Differences when using xrange compared to seperate values

[Alexander S. <ale...@gm...>]

Hello.

Using gnuplot 4.2 patchlevel 4 on an ArchLinux system.

Please have a look at those two PNG images, which have
been generated by Gnuplot:

http://public-files.askwar.s3.amazonaws.com/gnuplot_diff_date_extracted/all-in-one/load.0319.png
http://public-files.askwar.s3.amazonaws.com/gnuplot_diff_date_extracted/seperated/load.0319.png

As you'll notice, the curves look VERY different. But they
shouldn't look different...

For the first graph (the "all-in-one" image), I gave Gnuplot
a big CSV file containing all the values from this month. To
make it plot only the curve for one day (for 2009-03-19), I used:

set xrange [ "2009-03-19 00:00:00" : "2009-03-19 23:59:59" ]

In the 2nd image (in the "seperated" directory), I first grepped
out all the lines matching "2009-03-19" and then didn't use
a "set xrange" at all. Another way to get this, would have been
to do

plot "< grep 2009-03-19 val.2009-03.csv" ...

What I don't get at all is, why the curves look so different. They
shouldn't look different, should they?

For your reference, I made the files publically available. Please
see below for download URLs!

Thanks a lot for any help you can provide :)

Alexander

http://public-files.askwar.s3.amazonaws.com/gnuplot_diff_date_extracted/all-files.zip
(876k)

The ZIP files contains the following files, which you can also access
seperately:

http://public-files.askwar.s3.amazonaws.com/gnuplot_diff_date_extracted/all-in-one/load.19.gnuplot
http://public-files.askwar.s3.amazonaws.com/gnuplot_diff_date_extracted/all-in-one/val.2009-03.csv
http://public-files.askwar.s3.amazonaws.com/gnuplot_diff_date_extracted/all-in-one/load.0319.svg

http://public-files.askwar.s3.amazonaws.com/gnuplot_diff_date_extracted/seperated/load.19.gnuplot
http://public-files.askwar.s3.amazonaws.com/gnuplot_diff_date_extracted/seperated/Werte.0319.csv
http://public-files.askwar.s3.amazonaws.com/gnuplot_diff_date_extracted/seperated/load.0319.svg

Alexander
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Re: [Gnuplot-info] Help: No effect in changing linewidth

[Thomas S. <t.s...@fz...>]

if your gnuplot isn't complaining about the syntax, then you
are probably using version 3.7 and should upgrade to an
actual version.
the actual syntax for setting linestyles is:

set style line 1 linetype  1 linewidth 8


fedormma wrote:
> 
> Hi,
> 
> No matter how I change the linewidth, it always stay the same.
> 
> For example:
> 
> set linestyle  1 linetype  1 linewidth 8
> plot 0.2536*x+1.1717      title "LESQ fit" with lines      linestyle 1
> 
> Thanks,
> 

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Re: [Gnuplot-info] Z order of border in 3d plots

[Thomas S. <t.s...@fz...>]

'set hidden3d' should work, but the 'hidden3d' option in 'set pm3d' (which
is something different) doesn't hide the grid. a 'set grid back' could help.
if not, please post your script.


jammers wrote:
> 
> Hi,
> 
> Does anyone know how to make the border (axis/grid) appear behind the plot
> in a 3d mesh graph? hidden 3d doesn't remove it and I don't want to remove
> the borders
> 
> This is the output when I plot my function using gnuplot:
>  http://www.nabble.com/file/p22660903/test.png 
> 
> And this is the sort of thing I want to create (generated from octave on
> windows).
> 
>  http://www.nabble.com/file/p22660903/test2.png 
> 
> I'm running gnuplot version 4.2
> 
> Any help would be greatly appreciated.
> 
> Cheers,
> James
> 

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Re: [Gnuplot-info] math symbols in label/title environment

[Sebastian R. <ma...@se...>]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Hi guys,

 thanks a lot for your help ... it works fine. And sorry for this silly
question - I was not aware of the "gnuplot-doc" package within the LINUX
sources :-[


Sebastian

Marek W. Gutowski wrote:
> Sebastian Robitzsch wrote:
>> Hi folks,
>>
>> After searching the Internet without any suitable results, I finally
>> send this mail to this list. I hope someone can help me :)
>>
>> I use GnuPlot to obtain a 3D diagram of measured data. Since I have two
>> different graphs within the plot I use the "title" command after "splot"
>> to define which graph stands for which measured data.
>> However, I have issues with using math commands/symbols within this
>> environment. I've already figured out how to integrate greek symbols,
>> e.g.:
>>
>> set term postscript eps enhanced monochrome
>> set output "<FILENAME>.eps"
>> splot "file.csv" using 2:1:3 with lines title "CI_{max} <= {/Symbol m}
>> +- 0.212"
>>
>> Now I want to change the "+-" to the common math symbol, e.g. within
>> LaTeX "\pm"... Unfortunately, it seems like I can't produce such symbols
>> within this environment?!
>>
>> BTW - I've already figured out how to produce tex files that comprises
>> math commands (set terminal latex)... but this somehow does not work
>> well together with the LaTeX-Paper-template I have to use for the
>> considered publication.
>>
>> Any suggestions?
>>
>>
>> Best Regards,
>> Sebastian
>>
>  Try
> splot "file.csv" using 2:1:3 with lines title "CI_{max} <= {/Symbol
> m}{/Symbol \261}0.212"
> 
> In addition I enclose two files (you should have them already somewhere
> on your disk)
> explaining all the symbols available in PostScript enhanced terminal.
> 
> Marek Gutowski
> 
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.9 (GNU/Linux)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org

iEYEARECAAYFAknHuv0ACgkQp2EOnQ6jimYOjgCghzsY9y9RPrj3TlLYEikX1WcN
stIAniohas2IPzI+ndMWuS0IJAdVKP9+
=OQ59
-----END PGP SIGNATURE-----

Re: [Gnuplot-info] math symbols in label/title environment

[Thomas S. <t.s...@fz...>]

splot ... title "CI_{max} {/Symbol \243 m \261} 0.212"

seems that you are not aware of the 'postscript guide', delivered
together with the source code of gnuplot, on linux systems normally
located at:
/usr/share/doc/packages/gnuplot/doc/ps_guide.ps


Sebastian Robitzsch wrote:
> 
> Hi folks,
> 
> After searching the Internet without any suitable results, I finally
> send this mail to this list. I hope someone can help me :)
> 
> I use GnuPlot to obtain a 3D diagram of measured data. Since I have two
> different graphs within the plot I use the "title" command after "splot"
> to define which graph stands for which measured data.
> However, I have issues with using math commands/symbols within this
> environment. I've already figured out how to integrate greek symbols,
> e.g.:
> 
> set term postscript eps enhanced monochrome
> set output "<FILENAME>.eps"
> splot "file.csv" using 2:1:3 with lines title "CI_{max} <= {/Symbol m}
> +- 0.212"
> 
> Now I want to change the "+-" to the common math symbol, e.g. within
> LaTeX "\pm"... Unfortunately, it seems like I can't produce such symbols
> within this environment?!
> 
> BTW - I've already figured out how to produce tex files that comprises
> math commands (set terminal latex)... but this somehow does not work
> well together with the LaTeX-Paper-template I have to use for the
> considered publication.
> 
> Any suggestions?
> 
> 
> Best Regards,
> Sebastian
> 
> begin:vcard
> fn:Sebastian Robitzsch
> n:Robitzsch;Sebastian
> adr:;;;Dublin;;;Ireland
> email;internet:ma...@se...
> title:Dipl.-Ing. (FH)
> tel;cell:+353 (0)86 - 22 10 988
> note:Skype: seronline82
> x-mozilla-html:FALSE
> version:2.1
> end:vcard
> 
> 
>  
> ------------------------------------------------------------------------------
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> powering Web 2.0 with engaging, cross-platform capabilities. Quickly and
> easily build your RIAs with Flex Builder, the Eclipse(TM)based development
> software that enables intelligent coding and step-through debugging.
> Download the free 60 day trial. http://p.sf.net/sfu/www-adobe-com
> _______________________________________________
> Gnuplot-info mailing list
> Gnu...@li...
> https://lists.sourceforge.net/lists/listinfo/gnuplot-info
> 
> 

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[Gnuplot-info] math symbols in label/title environment

[Sebastian R. <ma...@se...>]

Hi folks,

After searching the Internet without any suitable results, I finally
send this mail to this list. I hope someone can help me :)

I use GnuPlot to obtain a 3D diagram of measured data. Since I have two
different graphs within the plot I use the "title" command after "splot"
to define which graph stands for which measured data.
However, I have issues with using math commands/symbols within this
environment. I've already figured out how to integrate greek symbols, e.g.:

set term postscript eps enhanced monochrome
set output "<FILENAME>.eps"
splot "file.csv" using 2:1:3 with lines title "CI_{max} <= {/Symbol m}
+- 0.212"

Now I want to change the "+-" to the common math symbol, e.g. within
LaTeX "\pm"... Unfortunately, it seems like I can't produce such symbols
within this environment?!

BTW - I've already figured out how to produce tex files that comprises
math commands (set terminal latex)... but this somehow does not work
well together with the LaTeX-Paper-template I have to use for the
considered publication.

Any suggestions?


Best Regards,
Sebastian

Re: [Gnuplot-info] Drawing waveforms , with co-ordinates in text format

[Thomas S. <t.s...@fz...>]

yes, you can use gnuplot for plotting data.
have a look at:
http://www.gnuplot.info/docs/node101.html


Yet_another_coder wrote:
> 
> Hi 
> I have a text file which contains comma separated X and Y co-ordinates of
> all points on a waveform.
> X-coods represent time and Y coods current/voltage values.Can I use
> gnuplot to read these co-ordinates and display a waveform.
> 
> Thanks
> PS: I am very new to gnuplot.So before I begin learning, just want to make
> sure that that  is the right tool for me.Therefore asking here!!
> 

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[Gnuplot-info] Re gion plot

[mboisson <max...@us...>]

Hello,
I am trying to do a region plot in gnuplot. The region is defined as : 
5/4 < rg^2 * (x + y)/x < 2

rg is some fixed parameter. 

I can't find a good and easy way to plot this. Am I a noob ?

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Re: [Gnuplot-info] Does gnuplot support logscale axes in box plots?

[Thomas S. <t.s...@fz...>]

gnuplot supports logscale with box plots,
but you may have missed the warning
"y range must be greater than 0 for log scale"


ozaltn wrote:
> 
> If I execute the script without 'set log y', it runs OK. But with 'set log
> y' I get an empty picture. Is it because gnuplot does not support logscale
> wit box plots?
> 
> Thanks
> 
> osman
> 
> set terminal png notransparent large
> set output "cat.png"
> set log y
> set title "histogram 603s"
> set xlabel "years"
> set ylabel "number of cats"
> set nokey
> set ticscale 0.001
> set xrange [0:20+1]
> set yrange [0:6126*1.2]
> set xtics rotate by 90
> set xtics ("1004.14"3, " 1012.79"4, " 1021.45"5, " 1030.10"6, " 1038.75"7,
> " 1047.41"8, " 1056.06"9, " 1064.72"10, " 1073.37"11)
> set x2tics ("1077.56"11, "1011.61"3)
> set multiplot
> plot 'routhistogramCBC.dat' with boxes fs solid 0.2
> set parametric
> set trange [0:6126*1.5]
> plot 2.5,t lt 2
> plot 11.5,t lt 5
> unset parametric
> set nomultiplot
> show output
> 
> 

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Re: [Gnuplot-info] Multiplot background

[Thomas S. <t.s...@fz...>]

maybe the 'set object rectangle' command can help, see 'help object'


olliM1980 wrote:
> 
> Dear all,
> I am currently trying to plot a small graph into a big one. This works
> fine so far using multiplot, but the problem is that the data points of
> the big plot are not erased by the small graph. I helped myself now by
> plotting a huge and wide arrow as background into the small graph, but I
> somehow have the feeling that there must be a better solution.
> 
> Thanks & best wishes, Olli
> 

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[Gnuplot-info] about graphic display controlled by mouse

[bsmile <dev...@gm...>]

I got two questions here, 

(1) how to undo the enlarged region back to the original region? 
one can press the right button of the mouse and move to select a region in
the graphic display to enlarge the graph and release the button to view the
details, but how to restore to the original scale after I finished viewing
the details? I have to type in command set auto x and set auto y to restore
it, but I guess there is simple mouse operation to do that ...

(2) how to restore the x/y scale orientation?
After I crazily clicked on the graphic screen, it mysteriously switched the
y axis to increase from up corner to low corner(the default is from low to
up), how to switch it back to the default?

Thanks,
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Re: [Gnuplot-info] how to specify the range to be a list of discrete numbers for plot

[Thomas S. <t.s...@fz...>]

the 'range' is an interval, so a range specification consists of 2 numbers.
what you are looking for are the x-axis tics at the specified positions:

set xrange [1:70]
set xtics 5
set xtics add (1)


lehe wrote:
> 
> Hi,
> I am new to gnuplot and was wondering how to specify the range of plot to
> be a list of discrete numbers? For example, I have a file data.dat
> consisting of a list of numbers each of which corresponds to the one of
> the same position in [1 5 10 15 20 25 30 35 40 45 50 55 60 65 70]. If I
> try
> 
> plot [1 5 10 15 20 25 30 35 40 45 50 55 60 65 70] '${data.dat}' w l lt 1
> lc 1 lw 6
> 
> I would get error with an arrow pointed at "5", saying "':' or keyword
> 'to' expected"
> Thanks for help me to fix this problem!
> 

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[Gnuplot-info] how to specify the range to be a list of discrete numbers for plot

[lehe <tim...@ya...>]

Hi,
I am new to gnuplot and was wondering how to specify the range of plot to be
a list of discrete numbers? For example, I have a file data.dat consisting
of a list of numbers each of which corresponds to the one of the same
position in [1 5 10 15 20 25 30 35 40 45 50 55 60 65 70]. If I try

plot [1 5 10 15 20 25 30 35 40 45 50 55 60 65 70] '${data.dat}' w l lt 1 lc
1 lw 6

I would get error with an arrow pointed at "5", saying "':' or keyword 'to'
expected"
Thanks for help me to fix this problem!
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Re: [Gnuplot-info] drawing data over an sphere (r is not constant)

[Thomas S. <t.s...@fz...>]

you could use 'set mapping spherical'

have a look at
http://www.gnuplot.info/docs/node199.html


aetherlux wrote:
> 
> Hi everybody,
> 
> I'd like to know how I can draw data over an sphere with different r
> (spherical coordinates) values for each point.
> 
> That is, in 2D I have this image
> http://ft2dc.uvigo.es/juan/gnuplot-trop.png
> 
> different values of Z for each longitude-latitude point which I can draw
> using pm3d or points palette.
> 
> I would like to draw the earth (an sphere) and then to draw the data
> over the sphere having as r=0 the surface of the sphere or the center.
> 
> In the figure linked abow I draw the earth orography from a file using
> my own color palette. I would like to know if there is a better way of
> displaying the "Earth" with gnuplot. I have thought about drawing the
> surface over the sphere with, and then instead of drawing the orography
> to use PovRay to apply a texture over the sphere.
> 
> Any suggestion is wellcomed. Thank you very much.
> -- 
> Juan Antonio Añel
> 
> http://juan.gulo.org
> 
> Grupo de Usuarios de Linux de Ourense (GULO)
> 
> http://www.gulo.org
> 
> "El sentido común es la cosa mejor repartida del mundo,
> pues cada cual piensa que posee tan buena provisión de él,
> que aún los más descontentadizos repecto a cualquier otra
> cosa no suelen apetecer más del que ya tienen"
> 
> "Commmon sense is the best distributed thing in the world,
> for everyone thinks he is so well-endowed with it that even
> those who are hardest to satisfy in all other matters are not
> in the habit of desiring more of it than they already have"
> 
> 
> ------------------------------------------------------------------------------
> Open Source Business Conference (OSBC), March 24-25, 2009, San Francisco,
> CA
> -OSBC tackles the biggest issue in open source: Open Sourcing the
> Enterprise
> -Strategies to boost innovation and cut costs with open source
> participation
> -Receive a $600 discount off the registration fee with the source code:
> SFAD
> http://p.sf.net/sfu/XcvMzF8H
> _______________________________________________
> Gnuplot-info mailing list
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> https://lists.sourceforge.net/lists/listinfo/gnuplot-info
> 
> 

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Re: [Gnuplot-info] Problem with the x-scale in the plot

[Thomas S. <t.s...@fz...>]

use 'set rmargin' to increase the right margin a little bit.


r.r...@fr... wrote:
> 
> Hi guys,
> 
> i'm a student from germany and i have a lil problem with a plot made with
> GNUplot.
> 
> My x-range is from 0 - 3000. this runs well, but the last zero from 3000
> is cut in half, so that you can see only the half of the last zero... like
> 300(       if ()=0, you know?
> 
> here is the code, can one help me?
> 
> set terminal png
> set title "Fuzzygewichtung bei einer Drehzahl von 0-3000 U/Min"
> set xrange [0:3000]
> set xlabel "Drehzahl [U/Min]"
> set ylabel "Gewichtung"
> set output "fuzzydrehzahl.png"
> set grid nopolar
> set key right bottom
> 
> set grid xtics nomxtics ytics nomytics noztics nomztics \
>  nox2tics nomx2tics noy2tics nomy2tics nocbtics nomcbtics
> set grid layerdefault   linetype 0 linewidth 0.25,  linetype 0 linewidth
> 0.25
> s_0(x,a,ep) = 0
> s_1(x,a,ep) = 2*((x-a+ep)/(2*ep))**2
> s_2(x,a,ep) = 1-(2*((a-x+ep)/(2*ep))**2)
> s_3(x,a,ep) = 1
> s(x,a,ep)= (x<=a-ep)?         s_0(x,a,ep):  \
>            (x > a-ep && x<a)? s_1(x,a,ep):  \
>            (x>a && x<a+ep) ?  s_2(x,a,ep):  \
>                               s_3(x,a,ep)
> unset label
> plot (1-s(x,900,900))**2 title "sehr langsam", \
>       1-s(x,900,900) title "langsam", \
>       1-((1-s(x,900,900))**2) title "mittel langsam", \
>       sqrt(s(x,1800,900)) title "etwas schnell", \
>       s(x,1800,900) title "schnell", \
>       (s(x,1800,900)**2) title "sehr schnell"
> 
> 

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[Gnuplot-info] drawing data over an sphere (r is not constant)

[Juan A. A. C. <aet...@gu...>]

Hi everybody,

I'd like to know how I can draw data over an sphere with different r
(spherical coordinates) values for each point.

That is, in 2D I have this image
http://ft2dc.uvigo.es/juan/gnuplot-trop.png

different values of Z for each longitude-latitude point which I can draw
using pm3d or points palette.

I would like to draw the earth (an sphere) and then to draw the data
over the sphere having as r=0 the surface of the sphere or the center.

In the figure linked abow I draw the earth orography from a file using
my own color palette. I would like to know if there is a better way of
displaying the "Earth" with gnuplot. I have thought about drawing the
surface over the sphere with, and then instead of drawing the orography
to use PovRay to apply a texture over the sphere.

Any suggestion is wellcomed. Thank you very much.
-- 
Juan Antonio Añel

http://juan.gulo.org

Grupo de Usuarios de Linux de Ourense (GULO)

http://www.gulo.org

"El sentido común es la cosa mejor repartida del mundo,
pues cada cual piensa que posee tan buena provisión de él,
que aún los más descontentadizos repecto a cualquier otra
cosa no suelen apetecer más del que ya tienen"

"Commmon sense is the best distributed thing in the world,
for everyone thinks he is so well-endowed with it that even
those who are hardest to satisfy in all other matters are not
in the habit of desiring more of it than they already have"